Poison (Ex)

Jellyfish often cluster together during
springtime or when environmental conditions such as an increase in ocean
temperature favor it. When conditions are right, jellyfish shift from
being a nuisance to being a menace, if accidentally so, for a jellyfish swarm,
unlike more aggressive monstrous kin like the giant jellyfish,
comprises not aggressive hunters but rather opportunistic strikers. They
do not generally move to attack nearby prey, but their nearly
translucent coloration makes it horrifically easy for a creature to swim
into a swarm unawares. Once a jellyfish swarm deals damage to a creature, the swarm pursues it for several rounds before giving up the chase. Many aquatic races use jellyfish swarms as defensive guardians, trusting a swarm’s lack of interest in moving to keep it stationary for long periods of time.